I know how you feel, I'm terrified of them! The cockroach spray sold in supermarkets abroad is very effective. I sprayed some around the entrance to my apartment in Fuerteventura and there were lines of dead roaches outside for about 5 days afterwards. in the morning, before you go out, close the windows and doors, spray all around the room, especially the edges, include the walls and curtains etc. Leave the windows and doors shut and go out for the day, when you return air the room (coz it will stink) and it should be ok.
Good luck